I Bond Maturity Calculator
Value of an I-bond at its 30-year maturity.
Your I-bond numbers never leave your browser — all math runs locally.Try: Purchase amount=1000, Purchase year=2023 → $1,000, 6.88%, $7,609, $6,609
How to use
I-bonds stop earning at 30 years. The calculator compounds the purchase-year composite for the full term.
FAQ
What happens at 30 years?
Interest stops; you can redeem at the final value or, in some cases, roll into a new bond.
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